[Test] Add test on dynamically added inputs (#3344)

Co-authored-by: github-actions <github-actions@github.com>

browser_tests/assets/dynamically_added_input.json

@@ -0,0 +1,82 @@
+{
+  "last_node_id": 9,
+  "last_link_id": 13,
+  "nodes": [
+    {
+      "id": 3,
+      "type": "KSampler",
+      "pos": [
+        0,
+        30
+      ],
+      "size": {
+        "0": 315,
+        "1": 262
+      },
+      "flags": {},
+      "order": 0,
+      "mode": 0,
+      "inputs": [
+        {
+          "name": "model",
+          "type": "MODEL",
+          "link": null
+        },
+        {
+          "name": "positive",
+          "type": "CONDITIONING",
+          "link": null
+        },
+        {
+          "name": "negative",
+          "type": "CONDITIONING",
+          "link": null
+        },
+        {
+          "name": "latent_image",
+          "type": "LATENT",
+          "link": null
+        } ,
+        {
+          "name": "dynamic_input",
+          "type": "FLOAT",
+          "link": null,
+          "_meta": "Dynamically added input via frontend JS logic"
+        }
+      ],
+      "outputs": [
+        {
+          "name": "LATENT",
+          "type": "LATENT",
+          "links": [],
+          "slot_index": 0
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "KSampler"
+      },
+      "widgets_values": [
+        156680208700286,
+        "randomize",
+        20,
+        8,
+        "euler",
+        "normal",
+        1
+      ]
+    }
+  ],
+  "links": [],
+  "groups": [],
+  "config": {},
+  "extra": {
+    "ds": {
+      "scale": 1,
+      "offset": [
+        0,
+        0
+      ]
+    }
+  },
+  "version": 0.4
+}

browser_tests/tests/nodeDisplay.spec.ts

@@ -67,4 +67,10 @@ test.describe('Optional input', () => {
       'missing_nodes_converted_widget.png'
     )
   })
+  test('dynamically added input', async ({ comfyPage }) => {
+    await comfyPage.loadWorkflow('dynamically_added_input')
+    await expect(comfyPage.canvas).toHaveScreenshot(
+      'dynamically_added_input.png'
+    )
+  })
 })